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module procedure_06_module
contains
subroutine cb(a,terminate)
implicit none
integer, intent(in), optional :: a
logical, intent(out), optional :: terminate
if (present(terminate)) then
print *, 'terminate = ', terminate
if (terminate) error stop
end if
end subroutine cb
end module procedure_06_module
program procedure_06
use procedure_06_module
logical :: terminate_var
call temp(cb)
contains
subroutine temp(call_back)
implicit none
procedure(cb) :: call_back
logical :: terminate_var = .false.
call call_back(terminate = terminate_var)
end subroutine temp
end program procedure_06
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